All posts tagged certificate

Windows Server 2012 and 2012 R2 End of Life

I want to remind you of a critical upcoming milestone that may affect your business. In just 60 days, we will reach the end of support for Windows Server 2012 and Windows Server 2012 R2. As of October 10, 2023, these operating systems will no longer receive security updates or technical support from Microsoft.

End of Support

End of support means your servers will be more vulnerable to security risks and potential threats. It is essential to take action now to ensure your IT infrastructure’s continued security and stability. Upgrading to newer, supported operating systems will protect your data and systems from potential cyber threats and provide access to enhanced features and performance improvements.

Don’t Wait

Now is the time to migrate those remaining workloads for those still running Windows Server 2012 and 2012 R2! Consider the following commonly deployed services that may still be running on Windows Server 2012 or 2012 R2 in your organization.

Remote Access – Windows Server Routing and Remote Access Service (RRAS) is commonly deployed to provide secure remote access for field-based workers. In addition, Absolute Secure Access (formerly NetMotion Mobility) is a widely implemented premium alternative to RRAS. Organizations may be hesitant to migrate these workloads because disrupting remote workers is painful.

DirectAccess – This remote access technology is widely deployed and extremely difficult to migrate. In addition, the complex nature of DirectAccess, with its many intricate interdependencies, poses a significant challenge to organizations migrating this role.

PKI – This is likely the most common enterprise service to be found running on Windows Server 2012 and 2012R2. Most organizations relying on Windows Active Directory Certificate Services (AD CS) to issue and manage enterprise certificates are reluctant to move this workload once it is deployed. This service is much easier to migrate than you might think! It can be done without disruption as well.

Consulting Services

We understand that upgrading might require careful planning and coordination, and our team is here to support you throughout the transition process. Don’t delay – take this opportunity to safeguard your organization’s data and systems by upgrading to the latest Windows Server version or exploring cloud-based solutions.

Get In Touch

Please don’t hesitate to contact us for further assistance or any questions regarding the upgrade process. Together, let’s ensure your business remains secure and productive. You can get started today by booking a free one-hour consultation to discuss your migration strategy. Just fill out the form below and I’ll provide more information.

Always On VPN July 2023 Security Updates

Hello, Always On VPN administrators! It’s the second Tuesday of the month, so you know what that means. Yes, it’s Patch Tuesday! This month’s security updates include several fixes for vulnerabilities potentially affecting Microsoft Always On VPN deployments.

RRAS Vulnerabilities

Microsoft’s July 2023 security updates include fixes affecting Windows Servers with the Routing and Remote Access Service (RRAS) role installed. Security vulnerabilities CVE-2023-35365, CVE-2023-35366, and CVE-2023-35367 are all Remote Code Execution (RCE) vulnerabilities with a Critical security rating and a CVSS score of 9.8. These security vulnerabilities in Windows Server RRAS are particularly troublesome due to the nature of the workload. RRAS servers are, by design, exposed to the public Internet. Although there are no known exploits in the wild at this time, this attack requires no special privileges other than network access. Administrators running Windows Server with RRAS installed are encouraged to update as soon as possible.

AD CS Vulnerabilities

Most Always On VPN implementations leverage enterprise PKI certificates for user and device authentication. Administrators commonly deploy Microsoft Active Directory Certificate Services (AD CS) to support this. This month there are two security vulnerabilities in AD CS marked as Important. CVE-2023-35350 and CVE-2023-35351 address RCE vulnerabilities that exploit a race condition on the server. However, AD CS servers are not exposed to untrusted networks. In addition, attackers would require administrative rights on the server to exploit these vulnerabilities.

Network Load Balancing

Finally, of importance to Always On VPN administrators using Windows Network Load Balancing (NLB) to provide load balancing for their RRAS servers, there is a vulnerability in the NLB service. CVE-2023-33163 addresses an RCE vulnerability in NLB identified as Important.

Additional Information

Microsoft July 2023 Security Updates

Windows Server 2022 KB5028171 (Build 20348.1850)

Windows Server 2019 KB5028168 (Build 17763.4645)

Windows Server 2016 KB 5028169 (Build 14393.6085)

Windows 11 22H2 KB8028185 (Build 22621.1992)

Windows 11 21H2 KB5028182 (Build 22000.2176)

Azure Conditional Access Certificates with SID Information Now Available

I recently wrote about changes to certificate-based authentication affecting Always On VPN implementations. These changes were introduced by Microsoft’s security update KB5014754. When the update is installed on domain controllers and enterprise Certification Authorities (CAs), administrators can perform strong user mapping for certificates used for Active Directory authentication. However, when first introduced, the update came with some serious limitations that prevented administrators from enabling full enforcement mode for certificate mapping.

Limitations

When KB5014754 is installed on an enterprise issuing CA, a new certificate extension (1.3.6.1.4.1.311.25.2) is added to the issued certificate that includes the principal’s (user or device) Security Identifier (SID). However, this only occurs when an online template is used. An online template is one with the subject name built from Active Directory information. The SID is not embedded in certificates issued using an offline template. Offline templates are templates where the subject name is supplied in the request. There are two scenarios where this causes problems for Always On VPN.

Microsoft Intune

Certificates delivered with Microsoft Intune via the Intune Certificate Connector use an offline template. This applies to certificates using PKCS or SCEP. Today, the SID is not embedded by issuing CAs using offline templates.

Azure Conditional Access

The short-lived certificate issued by Azure when Conditional Access is configured for Always On VPN did not include the SID. However, that recently changed.

Recent Updates

Today we can scratch Azure Conditional Access off the list of limitations for Always On VPN. Microsoft recently introduced support for the new SID extension in Azure Conditional Access certificates, as shown here.

Now when an Azure Conditional Access certificate is issued to an on-premises user or device account that is synced with Azure Active Directory, Azure Conditional Access will include the SID information in the issued short-lived certificate.

Intune

Unfortunately, we’re still waiting for Microsoft to address the limitation with certificates delivered using Microsoft Intune. Hopefully we’ll see an update for that later this year.